Originally Posted by
mariachi
Since I can't really be sure, I'm just going to the same shop where I bought the spokes and ask them to (critique) my work. They are renown for their quality, so I guess I can trust their advice.
I was dumb and didn't ask either the size of the spokes, or the material of the nipples...
Yep - "The first step is to take the parts back to the shop or call them to recheck the spoke length." You weren't dumb - you've done this once. The shop has done it enough they should know to double-check their work and inform you of the length they are giving you. It's simple to just include that on the receipt.